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By “cold backup” I assume that you’ve shut down the database and used OS commands to copy the datafiles, logfiles, controlfiles, and parameter file(s).

Now, if you restore these files to a machine that is running 8.1.7.4, you will in effect have an incomplete upgrade, as 8.1.7.4 has data dictionary changes as well as program changes over 8.1.7.2.

While in theory it _may_ be possible to run the various data dictionary update scripts (check the patchset documentation included with 8.1.7.4 for what runs after installing the software), I highly recommend restoring the database to a machine running the same version of Oracle, and then applying the patches to get to the latest rev of database software.

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